You are given a solution of 50 mL, 0.1 M NaOH, then which of the following statements is/are correct:

Options

A. On addition of 450 mL of water to this solution pH becomes 13
B. on addition of 100 mL, 0.1M `CH_(3)COOH` buffer solution will form
C. On addition of 50 mL, `0.1MCH_(3)COOHpH` becomes 9.5 `(pKa` of `CH_(3)COOH=4.74,log5=0.7)`
D. On addition of 25 mL of 0.1 M `CH_(3)COOH` pH becomes 12.5 `(log3=0.5)`

Answer

B, D

Explanation

(A). `underset(pH=12)(OH^(-))=(50xx0.1)/(500)=10^(-2)`
(B). `underset(5)underset(10)CH_(3)COOH+underset(0)underset(5)NaOHtoCH_(3)COONa+H_(2)O`
(C). `underset(0)underset(5)CH_(3)COOH+underset(0)underset(5)NaOHtounderset(5)(CH_(3)COONa+H_(2)O)`
`pH=7+(1)/(2)xx4.74+(1)/(2)log(5)/(100)=8.72`
(D). `CH_(3)COOH+NaOHtoCH_(3)COONa+H_(2)O`
`[OH^(-)]=(2.5)/(75)=(1)/(30)M`